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у тетраэдра группа вращений — PSL_2(F_3), у икосаэдра — PSL_2(F_5), а как собрать из треугольников нечто регулярное с группой симметрий PSL_2(F_7)?

картинки на выходные пусть будут про квартику Клейна и ее симметрии, http://www.gregegan.net/SCIENCE/KleinQuartic/KleinQuartic.html (выше — одна из них)



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у тетраэдра группа вращений — PSL_2(F_3), у икосаэдра — PSL_2(F_5), а как собрать из треугольников нечто регулярное с группой симметрий PSL_2(F_7)?

картинки на выходные пусть будут про квартику Клейна и ее симметрии, http://www.gregegan.net/SCIENCE/KleinQuartic/KleinQuartic.html (выше — одна из них)

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Additionally, investors are often instructed to deposit monies into personal bank accounts of individuals who claim to represent a legitimate entity, and/or into an unrelated corporate account. To lend credence and to lure unsuspecting victims, perpetrators usually claim that their entity and/or the investment schemes are approved by financial authorities. Perpetrators of such fraud use various marketing techniques to attract subscribers on their social media channels. In a statement, the regulator said the search and seizure operation was carried out against seven individuals and one corporate entity at multiple locations in Ahmedabad and Bhavnagar in Gujarat, Neemuch in Madhya Pradesh, Delhi, and Mumbai. "And that set off kind of a battle royale for control of the platform that Durov eventually lost," said Nathalie Maréchal of the Washington advocacy group Ranking Digital Rights.
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